#include<stdio.h>
void exchange(int a,int b);
int main()
{
	int a=3,b=4;

	exchange(a,b);
	return 0;
	
}
void exchange(int a,int b)
{
	
	int c;
	c=a;
	a=b;
	b=c;
	printf("jiaohuan a=%d,b=%d",a,b);
	
}
